mjhjmtu

Here is what i get:

[zehu@danville ~]$ groups
apl vboxusers
[zehu@danville ~]$ 

[zehu@danville ~]$ grep zehu /etc/passwd 
[zehu@danville ~]$ 

[zehu@danville ~]$ grep apl /etc/group
[zehu@danville ~]$ 

[zehu@danville ~]$ grep vboxusers /etc/group
vboxusers:x:1540:zehu
[zehu@danville ~]$ 

Could anyone tell me if that's normal or not? and why is that? Thanks for help!

 [zehu@danville ~]$ sudo grep zehu /etc/shadow 
 [zehu@danville ~]$ 
 [zehu@danville ~]$ id 
 uid=1580(zehu) gid=1100(apl) groups=1100(apl),1540(vboxusers) 
 [zehu@danville ~]$ getent group apl 
 apl:x:1100: 

[zehu@danville ~]$ ypcat passwd | grep zehu
zehu:beL3WqT.4rb5Y:1580:1100:Zeyu Hu:/home/zehu:/bin/tcsh

The system that you are using uses a directory service (examples of these are NIS, NIS+, and LDAP) for some users and groups, including yourself and your apl group, rather than local entries in /etc/passwd and /etc/group.

This is common on systems where the users and groups are administered on a central machine. It makes it easier, from a system administration standpoint, to allow users to log in on any number of other machines (login nodes or compute cluster nodes) without having to manually update the required files on all machines whenever some user or group information changes.

The getent utility may be used to get information about local users and groups and about users and groups served from a directory service.

To see your passwd entry, use

getent passwd "$LOGNAME"

or

getent passwd "$( id -u )"

To see your group entries, use

getent group $( id -G )

Change -G to -g to only get your primary group.

For more information, see

• The NIS article on Wikipedia


• The NIS+ article on Wikipedia


• The LDAP article on Wikipedia